[docs] add info on not needing project id in browserbase session params to docs

[chrisreadsf]

why

reflect project id changes in docs

what changed

advanced configuration comments

test plan

reviewed via mintlify on localhost

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Latest commit: 44b65ea

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[greptile-apps]

Greptile Summary

This PR adds clarifying comments to the Browserbase session configuration examples, explaining that the projectId parameter is optional and automatically set when provided via environment variables or Stagehand parameters.

• Added helpful documentation comments to both TypeScript and Python code examples
• Maintains consistency between both language examples
• Improves developer experience by clarifying optional parameter behavior

Confidence score: 5/5

• This PR is safe to merge with no risks
• Documentation-only changes that add clarifying comments without modifying any functional code
• No files require special attention

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